FR1267355A - Perfectionnements aux objectifs à longueur focale variable - Google Patents

Perfectionnements aux objectifs à longueur focale variable

Info

Publication number
FR1267355A
FR1267355A FR832900A FR832900A FR1267355A FR 1267355 A FR1267355 A FR 1267355A FR 832900 A FR832900 A FR 832900A FR 832900 A FR832900 A FR 832900A FR 1267355 A FR1267355 A FR 1267355A
Authority
FR
France
Prior art keywords
enhancements
focal length
variable focal
length lenses
lenses
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
FR832900A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rank Precision Industries Ltd
Original Assignee
Rank Precision Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB24156/59A external-priority patent/GB953863A/en
Application filed by Rank Precision Industries Ltd filed Critical Rank Precision Industries Ltd
Application granted granted Critical
Publication of FR1267355A publication Critical patent/FR1267355A/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • G02B15/1431—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive
    • G02B15/143105—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive arranged +-+

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
FR832900A 1959-07-14 1960-07-13 Perfectionnements aux objectifs à longueur focale variable Expired FR1267355A (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB24156/59A GB953863A (en) 1959-07-14 1959-07-14 Improvements in or relating to optical objectives of variable focal length
GB3005459 1959-09-03

Publications (1)

Publication Number Publication Date
FR1267355A true FR1267355A (fr) 1961-07-21

Family

ID=26256951

Family Applications (1)

Application Number Title Priority Date Filing Date
FR832900A Expired FR1267355A (fr) 1959-07-14 1960-07-13 Perfectionnements aux objectifs à longueur focale variable

Country Status (5)

Country Link
US (1) US3081671A (fr)
CH (1) CH380405A (fr)
DE (1) DE1301152B (fr)
FR (1) FR1267355A (fr)
NL (1) NL253793A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS524461B2 (fr) * 1973-03-23 1977-02-04
JPS5441333B2 (fr) * 1973-03-23 1979-12-07
US3992083A (en) * 1973-03-23 1976-11-16 Canon Kabushiki Kaisha Variable focal length optical system of super-high magnification ratio

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE101010C (fr) *
GB381662A (en) * 1931-08-18 1932-10-13 Arthur Warmisham Improvement in lenses
GB449434A (en) * 1935-11-04 1936-06-26 Hugh Ivan Gramatzki Improvements in photographic and like objectives
US2179850A (en) * 1937-03-17 1939-11-14 American Optical Corp Optical system for measuring changes in magnification
NL90813C (fr) * 1950-07-18
DE1009820B (de) * 1955-05-21 1957-06-06 Schneider Co Optische Werke Objektiv mit variabler Brennweite
US2906172A (en) * 1955-05-21 1959-09-29 Schneider Co Optische Werke Varifocal objective system

Also Published As

Publication number Publication date
NL253793A (fr)
DE1301152B (de) 1969-08-14
CH380405A (fr) 1964-07-31
US3081671A (en) 1963-03-19

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